"Customers with NBN voice and data services and ADSL services may be having difficulty connecting to the internet," a Telstra spokesperson said of the incident.

"The issue commenced early this morning, and is impacting NBN-based services and a small number of ADSL services. Services are in the process of being restored."

At 11am AEST, Telstra said a "significant restoration" of services had occurred, but that customers in NSW may still be affected.

The Australian incumbent telco has had a rough start to 2016, with customers subjected to three outages over a period of six weeks: The first on February 22, which affected prepaid and post-paid mobile services and was caused by "embarrassing human error"; the second on March 17, which involved an hours-long national mobile data and voice outage; and the third on March 22, which was a smaller voice outage.

Telstra has since committed to spending an additional AU$50 million on improving the monitoring and recovery times of its network.

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